Property, Plant, and Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment Property, plant and equipment consisted of the following (in thousands):

	Estimated Useful Lives (Years)	June 30,		December 31,
		2021		2020
Land	N/A	$	1,340	$	1,340
Buildings and land improvements	15-39	2,486		2,486
Manufacturing equipment	7	13,513		13,261
Furniture, fixtures and equipment	5-7	477		443
Vehicles	5	161		140
Hardware and software	3-5	1,603		887
Machinery in progress		178		—
Total		19,758		18,557
Less: accumulated depreciation		(9,995)		(8,783)
Property, plant and equipment, net		$	9,763	$	9,774

Depreciation expense was $0.6 million and $0.6 million for the three months ended June 30, 2021 and 2020, respectively, of which $0.5 million and $0.5 million, respectively, has been allocated to cost of revenue and $0.1 million and $0.1 million, respectively, is included in depreciation and amortization in the accompanying condensed consolidated statements of operations for the three months ended June 30, 2021 and 2020.

Depreciation expense was $1.2 million and $1.2 million for the six months ended June 30, 2021 and 2020, respectively, of which $1.0 million and $1.0 million, respectively, has been allocated to cost of revenue and $0.2 million and $0.2 million, respectively, is included in depreciation and amortization in the accompanying consolidated statements of operations for the six months ended June 30, 2021 and 2020.